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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23f7a0bb28fa1b1de81940c0ebf9cf072158da70c0b69952d0f3796a75faf68' 
  AND token = 'bLMM59q0KCiG8el5NyrazrXk9biuzU5ytbb4uZ6A2kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}